Door opening/closing device
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United States of America Patent
Stats
-
Apr 25, 2017
Grant Date -
Apr 9, 2015
app pub date -
Apr 18, 2013
filing date -
Apr 20, 2012
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A door opening/closing device includes a shaft member installed on a first door panel side so that it cannot rotate. Both ends of a torsion spring in the door opening/closing device are latched to a second door panel side via torsion spring latching walls, and a center portion of the torsion spring is latched to the first door panel side via a latched member, a latching portion, and the shaft member. When the first door panel and the second door panel are pulled from the state in which the doorway is closed, the first door panel and the second door panel fold about an outside cylindrical member as center. The outside cylindrical member rotates relative to the shaft member. First and second coil portions deform elastically in the direction that they are each wound tighter, and the first and second door panels are opened and the doorway is opened.
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Cited Art Landscape
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